Dear croope, Other than TSH, there are around 15 additinal levels that can be tested for to aid in thyroid diagnosis. Although TSH may be the most common , it really depends on which tests were done and their results considered together. My thyroid tests are typically more comprehensive.Do you have a copy of the lab results? You would be able to see other test results in the thyroid section. If not, call your Dr's office to get clarification for this good question question and make sure there was no error. Best Regards, 4N Substances.

the TSH is backwards to us, A low TSH means high levels of thyroid, a high TSH means low levels of thyroid in your body. So a person with a low TSH needs means the thyroid replacement hormone-synthroid needs to be lowered.